| 摘要 |
PROBLEM TO BE SOLVED: To provide a technique capable of detecting an individual operation even in a state that there are no power supplies at all from a commercial power system in a power leveling device including a compensation function of effective power and reactive power.SOLUTION: A control device 14a of a power leveling device 50a controls a power converter 12 so that each of effective power and reactive power of the power converter 12 and an important load 7 calculated by inputting each detection value from a voltage detection section 9, an important load current detector 11 and a power converter current detector 10 coincides with the corresponding effective power command and reactive power command. Further, the control device 14a includes a positive detection PLL block 102 for positively detecting the individual operation and a passive detection PLL block 103 for passively detecting the individual operation and reactive power fluctuation command sections (a reactive power fluctuation command 105 and a reactive power fluctuation command adder 106) for periodically fluctuating the reactive power command of the power converter 12 to detect the state that there is no power supplies from a commercial power system 1. |
